Cutter for liners of milking-machine teat cups



4 Oct. 28, 1930. J. 1.. HULBERT 1,780,016

CUTTER FOR LINERS OF MILKING MACHINE TEAT CUPS Filed June 2'7, 1928 Patented Oct. 281930 I I PATENT? orFlcE: i

' JOHN L. HU LB RT, F roUGHKEnrsIE, NEW Yonx, Assrenon To TI-IE DE LAVA]; E94;

RATOR COMPANY, or NEW'YOR-KfN. Y,.,

A CORPORATION on NEW" JERSEY CUTTER FOR LINERS or MILKING-MAGHINE TEAT curs Application filed .Tune 27,

The teat cups of some milking machines,

predetermined length.-. The inventioncoim,

prises a cutting or trimming device bymeans of which the liner may be so trimmed that its length will'be, uniform along all longitudinallines and which will be cheap to construct and easy to operate.

In the accompanying drawings, which.

: show several of many different specific embodiments of my invention- 7 Fig. 1 is a side elevation of the mandre with a cutter guide and holder mounted thereon.

7 Fig. 2'is an end view of the same. F ig. 3 isra perspective view of the guide and holder of Figs. 1 and '2.

Fig. 4 is a perspective view of a modified e 39 construction of knife guide and holder.

Fig. 5 is a perspective view of anothermodified construction, ofknife guide andholder.

'Reterring. first to "the, construction shown in.Fi,gs.'1,2 and 3: I e

The base of the device is a mandrel a having end sections of diflferent diameters and an intermediate tapered section. n The knifefguiding and'supporting device comprises wings b, 6, adapted to fit on opposite sides of the enlarged end portion of the .mandrel, a stop 0 adapted, to abutagainst the end of the enlarged portion of the mandrel, V

a neck clextending forward of the side wings, and a knife-supporting plate e depending from the front end of the neck (Z. rrknife m is held against the plate e by means of fingers f, f, behind which the knife has been forced and is maintainedin proper position by bottom lugs g, g, and top lugs h, h. The

the, top edge of platec may be cut away to shortening the liner to the'correct length supporting'device is extended upward. and

' 1928.- Serial No. 288,566.

lugs andfingersmay beintegral with plate 6. Thebottom edge of plate 6, between lugs;- g, g, may be concaveto allow theknife edge The neck (Z and to project-below the plate.

facilitate the insertion and withdraw al of knife. i 1 i 1 In operation, the tubular liner isipushed over the smaller end portion of the mandrel until its trailing end aligns with a ring 2' cut in, or otherwise formed on, the mandrel. The advanced end will then have been forced, over the taperedportion. nd" onto thelarger end portionof themandrel. a e The k'ife guide and holder is then prea sented to the larger end portion 0f the mandrel at an angle, as shown. in broken .lines, F 1g." 1, Withthe stop cagainst the end of the I mandreliand is thenv swimg about an axis atright angles to that ,of the mandrel away from said brokenlineposition until the guide wingsjb,' b',.-pass at mandrePs sides, as shownin the fulllineposition, Fig. 1, and

- h 'k1i ie' Qbntactswith the liner, While the 7.5. he nmidrel endthe l n r 'ft l en r knifeis maintained pressed againstthe liner,

rotated, produe ingsmooth, true cut-,1 and is: 4', the eki i tt guiding arid he d ward to fo mt e ppo g P t m and-wof a clamp for receiving and holding the knife blade. 7

In Fig, 5 the cgnstruction is the same as in 4; exceptthat the from member '0. of the clamp isprovided with laterally and down. 'wardly' extending ears p which extend be yondthecorners the knife m andeliminate dangerof the user cuttinghisfingers. V

. Having now fully described my invention, what I-iclai n and desire to protect by Letters Patentis: f I

1;. In a rubber tube trimmer, the combina-v tion-witha mandrel over which the tube is adapted to be. stretched, of aknife-supporting member, a stop adapted tog be pressed against; one end of the mandrel, and a body'connecting. V the st'opand knife-supporting member and J adapted to partly surround the mandrel, the i knife being thereby held: a predetermined 10,0

position relative to the mandrel while the tubie in thte rotation of the mandrel relative to a1 mem er. tigairgrdrel is relatively rotated within said s In testimony of vahicthP l l li 11? 2. In a rubber tube trimmer the combinahereunto Set my ba 8 011g e p 9W tion with a mandrel over whiizh the tube is York, ont 70 adapted to be stretched, of a knife holder and JOH guide comprising a knife clamp, a stop adapted to engage one end of the mandrel, and two wings adapted tofit on opposite sides of the 10 mandrel and hold the knife 111 a predetermined position while the mandrel 1s rotated relative to the knife holder and guide.

3. In a rubber tube trimmer, the combination with a mandrel having ends of different diameters and a tapered portion between its ends and provided with an arcuate tube-posltioning mark, of a knife holder and guide comprising a guide swingable into and .ontof engagement with the mandrel and w thin 0 which the mandrel is rotatable when the gu de is engaged therewith, a stop carried at one end of the guide and adapted to engage the larger diameter end of the mandrel and properly p0- sition the knife holder and guide longitudi- I 5' nally, and a knife holder carried atthe other end of the body and adapted to so position the knife when the guide is. in operative relation with the holder that the knife maybe in cutting relation to the tube while the mandrelis a0 rotated. v I

4. In a rubber tube trimmer, the combination with a mandrel over which the tubeis adapted to be stretched, of abody adapted to 4 be supported'on the mandrel so as to extend a, longitudinally, and at an angle to the axis, V 7 I i V of the mandrel and to be then swung down to bring the body into guiding relation with the mandrel so as to allow of therotation of the ,1 mandrel therein, a knife-oarryingmember on 4b the swingable end of the mandrel, and a knife 7 i 1 V 106 carried by said member and adapted, when the body, by said swinging movement, is brought into guiding relation with the mandrel, to be brought toward cutting relation v V with th tube stretched on the mandrel. r 110 5. In a rubber tube trimmer, the combina- I tion with a mandrel over which the tube is adapted to be stretched, of a channelled body and a knife carried thereby, said body and I knife being movable respectively into guiding relation with the mandrel to allow of the rotation of the mandrel therein and into cutting relation with thetube stretchedthereon.

6. In arubber tube trimmer, the combina- I 55 tion with a mandrel having opposite end pora I tions of different diameters, the end portion of smaller diameter having an arcuate tubepositioning mark, the tube to be trimmed bemg adapted to be slipped on to and along the z I 0 end of the mandrelof smaller diameter and a I engage the end portion of larger diameter, of I V r k a knife, and a knife-supporting member supportable on the larger diameter portion of the mandrel and movable into and out of position a u to place the knife in cutting relation with the 1 

